Tablet making machine



Sept. 10, 1940.

R.P.MAGNENAT TABLET MAKING MACHINE Filed Feb. 2, 1937 7 Sheets-Sheet l HVVEIUTIR Rene PMzgnemt.

AIYTHHVEY P 10, 1940- R. P. MAGNENAT 2,214,505

TABLET MAKING MACHINE Filed Feb. 2, 1937 7 Sheets-Sheet 2,

as n-ll I' l I" HII 3 834 INVENTOR Rene PMagnenal.

ATTORNE p 1940- R. P. MAGNENAT TABLET MAKING MACHINE 7 Sheets-Sheet I5 Filed Feb. 2, 193'? 2 NE S L 48 1 j w m. b mm 7 T mm W 00. vM 9 II m w y B v. 7 B we m w I ATTORNEY Sept. 10, 1940. R, MAGNENAT 2,214,505

TABLET MAKING MACHINE Filed Feb. 2, 193". 7 Sheets-Sheet 4 w moo IN VENT OR RenPMag-nenat.

A TT ORNE Y p 1940- R. P. MAGNENAT TABLET MAKING MACHINE Filed Feb. 2, 1937 7 Sheets-Sheet 5 IN VEN TOR RenEMagnenaZ.

A TT ORNE Y P 10, 1940- R. P. MAGNENAT 2,214,505

TABLET MAKING MACHINE Filed Feb. 2, 193? 7 Sheets-Sheet 6 \INVENTOR Rene PMagnenat.

A TTORNE Y P 10, 1940- R. P. MAGNENAT 2,214,505

TABLET MAKING MACHINE Fi led Feb. 2, 193'? 7 Sheets-Sheet 7 ATTORNEY Patented Sept. 10, 1940 UNi'i'E S'E at ases ere'r orrrcs TABLET MAKING MACHINE Application February 2, 1937, Serial No. 123,627

21 Claims.

This invention relates to machines for making solid tablets from powdered materials, and more particularly to a tablet making machine of this nature having an improved die-filling mechanism, a punch mechanism, a tablet ejector, and means for adjusting said punch mechanism and tablet ejector.

Previous machines for producing tablets and like products from powdered material for use in making buttons, insulating washers, blanks requiring further operations, etc., were subject to the disadvantage that the powdered material employed would fly about in.the form of dust, and would settle upon the operating parts thereof, particularly on surfaces having exposed lubricant, such as gears, cams and slides. This usually produced abrasion, sticking and injurious strains and fatigue, and therefore, sometimes resulted in breakage and failures.

A further disadvantage of such machines was that the lubricating oil or grease supplied to the various bearings would often creep into the die, and cause discoloration of the tablets, rendering them useless,-and it was impossible to removesuch lubricant without completely overhauling the machine.

A still further disadvantage of such prior tablet making machines was that considerable time and labor were required to make the necessary adjustments in the punch and ejector strokes, so that they would properly cooperate to form the desired product. In many instances such adjustments required a complete resetting of the machine for each trial,-an operation which was time and labor consuming and seriously interfered with production. Moreover, the former types of tablet presses were often quite complicated in design and the parts requiring adjustment were relatively inaccessible.

By means of the present invention, the above and other disadvantages have been avoided and a tablet making machine has been provided having a rectangular multiple punch and die hold-- er in which it is possible to compress tablets of a great variety of shapes and sizes. The die cavities may be arranged compactly in a pair of spaced straight rows resulting in rapid production. The parts are readily accessible for quick adjustments and the principal operating parts are effectively sealed from loose powder or lubricant.

One object of the present invention is to provide a machine of the above nature having means for permitting the size and weight of the tablets to be adjusted without disassembling the parts of the machine.

A further object is to provide a machine of the above nature having an improved form of adjustable relatively shockless tablet ejecting mechanism.

Another object is to provide in such a machine, cam and eccentric means driven by a common central source of power for operating the punch-carrying head and the tablet ejector mechanism.

A further object is to provide a machine of the above nature which will be extremely strong and compact, having only a few projecting parts, and provided with means for effectively lubricating the parts subject to the greatest stresses.

A further object is to provide a machine of the above nature having an improved form of hopper for supplying loose powder to the die and an improved pendulum operated powder agitator located in said hopper.

A still further object is to provide a tablet making machine of the above nature which will be relatively simple in construction and inexpen sive. to manufacture compared to its wide range of uses, easy to manipulate and clean, and very eflicient and durable in use.

With these and other objects in view, there have been illustrated on the accompanying drawings several forms in which the invention may conveniently be embodied in practice.

In the drawings:

Fig. 1 is a front elevational view of the improved tablet-pressing machine.

Fig. 2. is a side elevational view of the same.

Fig. 3 is a top plan view of the same.

Fig. 4 is an enlarged fragmentary vertical sectional view taken on the line lil of Fig. 3, and illustrating the operation of the powder agitating means and the adjusting mechanism for the punch carrying rim.

Fig. 5 is an enlarged horizontal partial sectional view taken generally on the line 5-5 of Fig. 2.

Fig. 6 is a vertical sectional view taken on the broken line 65 of Fig. 5, and illustrating the operation of the ejector mechanism.

Fig. 7 is an elevational view, partly in section, taken on the broken line 1-1 of Fig. 5.

Fig. 8 is a fragmentary sectional view taken on the line 8-8 of Fig. 5, illustrating the relaticnship of the parts of the ejector mechanism in various adjusted positions.

Fig. 9 is an enlarged fragmentary sectional view taken on the broken line 99 of Fig. 5.

Fig. 10 is an enlarged sectional plan view of the die block taken on the line l9lfl of Fig. 1 looking downwardly.

Fig. 11 is an enlarged top plan view of the ejector block and ejector rods taken on the line ll-ll of Fig. 1.

Fig. 12 is a view similar to Fig. 11 of a modified form of the machine which may be used to make hollow or perforated compressed tablets.

Fig. 13 is a vertical fragmentary sectional view taken on the line I3 l3 of Fig. 12, showing the different tools required for forming such perforated tablets.

Fig. 14 is a plan View of a modified form of mechanism for agitating the powdered material.

Fig. 15 is a vertical section taken on the line !5-|5 of Fig. 14.

Fig. 16 is a section taken on the line Iii-16 of Fig. 14.

Referring now to the drawings wherein like reference characters denote corresponding parts throughout the several views, the numerals l5 and 16 indicate lower and upper frames, respectively, which frames are secured together as by bolts for supporting the various mechanisms of the machine. The upper portion of the upper frame I6 forms a horizontal supporting table for a die block IT in which is mounted a die 18, herein shown as having a plurality of tablet forming openings 19, said die 18 being retained in place, as by means of clamp bars 20 (Figs. 2 and 13).

The die block 11 extends between two upright members 2! and 22 which, as clearly shown in Fig. 7, are interconnected with said block by means of cooperating tongues and grooves 23. A plurality of punches 24 are suspended by a punch block 25, which in turn is secured to a cylindrical ram 25 (see Fig. 4), and said punches 24 are arranged in vertical alinement with the die openings 19 so that when the ram 26 descends, they will enter the dies and compress the loose powdered material. disposed therein.

The punch ram 26 is movably mounted in a horizontal head 21, and as shown in Fig. 4, may be adjusted vertically therein by means of a threaded sleeve 28, the threads 29 of which 00- operate with threads formed in the head 21. The sleeve 28 is connected to a gear 30 at its upper end, and said sleeve loosely surrounds a vertical rod 31 secured at its lower end in the ram 26 and to an upper collar 32 disposed in a recess in the gear 39. As shown in Fig. 2, a key 33 is provided between the horizontal head 21 and the ram 25 to retain the latter against rotative movement. In order to rotate the gear 39, provision is made of a pinion 34 rotatable by a hand wheel 35, said pinion 34 being in mesh with the gear 30 to rotate the same and with it the sleeve 28 to vertically adjust the ram 26 and the punches 2 1 with respect to the die 18.

In order to vertically reciprocate the horizontal head 21 and the ram 25, said head 21 is connected as by means of nuts 35 (see Fig. 4) to a plurality of vertical tie rods 31, one of which is disposed at each corner of the head, and which extend downwardly therefrom in two pairs to a point below the upper frame IS. The tie rods 31 pass through the ends of a pair of laterally spaced cross-beams 38 and 39, and then into a pair of bearing and guiding lugs 49, respectively, formed on the lower frame l5. The tie rods 31 are retained in connection with the crossbeams 38 and 39 by means of nuts 4| located beneath said cross-beams (see Fig. 7). Each cross-beam 38 and 39 has a slotted opening 42 formed in its center portion wherein is disposed one end 43 of a pair of downwardly extending crank-links 44 which are rotatably connected to the cross-beams 38, 39 by pivot pins 45. The crank links 44 are rotatively mounted at their lower ends 46 upon short eccentric pins 41 and 4-8 extending from opposite ends of a horizontal main shaft 49 which is journaled in bearings 50, 51 in the lower frame 15. By means of this construction, the crank-links 44 will cause a reciprocating action to be imparted to the crossbeams 38 and 39, the four tie-rods 31, the crosshead 21 and the punches 24.

The main shaft 49 is adapted to be rotated by a large drive gear 52 (Fig. 6) which is suitably keyed to the shaft by keys 53, and is disposed between the bearings and 5| (see Fig. 7). As shown in Fig. 6, the gear 52 meshes with a pinion 54 mounted on a horizontal cross-shaft 55, which extends out of the frame 15 and has a pulley 55 secured thereon. The pulley 56 may be suitably driven by means of a belt 51 (Fig. 1) from any desired source of power, such as an overhead countershaft receiving power from a motor, not shown.

In order to assist the main shaft 49 in raising the head 21 at each upward stroke of the links 44 and tie-rods 31, provision is made of two coiled compression springs 58 (see Fig. l), the lower ends of said springs engaging against the upper surface of the upper frame 16, and the upper ends pressing against the upper ends of two flanged tubular inverted casings 59, respectively,

Two

Die-filling mechanism The mechanism whereby the die openings 19 may be positively filled with powdered material, and the formed pellets or tablets intermittently removed from the upper face of the die block 11 after they have been ejected from the dies as hereinafter described, is most clearly illustrated in Figs. 2 and 4. This mechanism includes a hopper 62 which is supplied with powder by gravity through a flexible tube 63 (Fig. 2) from any desirable source of supply, such as a large overhead magazine or container (not shown). The hopper B2 is arranged to reciprocate across the upper surface of the die block 11 between the strokes of the punch permitting the loose powdered material to fall through the opening 64 in the bottom of the hopper into the die openings l9. Intermittent sliding movement is imparted to the hopper 62 by means of a horizontal connecting bar 55 (see Figs. 2 and 4), which extends rearwardly and is connected with the hopper 62. The bar 65 is guided in a suitable bracket 65, and is joined by means of an upwardly inclined bifurcated link 61 to the head 21. The bar 55 rides on and between two pairs of rollers 58, 68, and the bracket 65 is rigidly supported on the upper machine frame I6 by horizontal webs 69. The upper end of the bifurcated link 61 is loosely connected to a bolt 10 which extends across a pair of spaced apart arms 1! on the head 21, and said bolt 18 passes through slotted elongated openings 12 in the ends of said link, whereby back-lash is provided for a purpose to be hereinafter described. The

The bifurcated link 61 to a pair of horizontal owed to an ejector ram 90.

inclined link 61 is pivotally joined with the hopper bar 65 by means ofa plate I3 (Figs. 3 and 4), having a tongue 14 extending from one side thereof and adapted to enter a slot I5 formed in the bar 65 and extending lengthwise thereof. has apair of bottom legs I! mounted on a cross-bolt 16, passing through a horizontal slot 18 in thebar 65, and said bolt 16 clamps the plate I3 to said bar 65. The tongue '14, the plate I3, and the adjacent side of the bar 65 are corrugated I prevent relative slippage of these parts. and the slot 18 permits adjustment in the stroke of the hopper 62. A downwardly inclined sheet metal chute 86 is preferably secured at the front of the die block I! toguide the pellets 81 after they have been pushed off thedie I8 by the hopper 62. i v

In order to insure that the die openings I9 are completely filled before the punches 24 descend, provision is made of an agitator 00 in the hopper for preventing the powdered material from caking (see Figs. 1 and 4) The agitator 80 includes a U-shaped wire bail whichlis pivoted to the sides of the hopper 62 by hooks 0| on its outer ends, said hooks 8! extending through said sides and being connected outside of said hopper 62 rods 82, which extend rearwardly along both sides of the bar.65 and the bracket 66, and are respectively connected to a pair of spaced apart pendulum arms 83 (see Fig. 4).

The pendulum arms 83 are pivotallyconnected to the outer rear end of the sliding bar 65, and each arm 83 is connected to a cylindrical weight 85 disposed between and held by the lower ends of said arms. By means of this construction, a swinging movement will be induced in the pendulum by the reciprocating movement of the hopper 62, and the momentum of the weight 85 will cause the wire-bail agitator to reciprocate across the die openings I9, thereby loosening any compacted material, and causing the powder to rapidly fall into the die openings and completely fill them.

It will be understood that the back-lash of the elongated slot 12 in the inclined link 61 will produce sudden starting and stopping actions of the hopper 62, and insure that the bail 80 will pass to and fro over the die openings after each stroke of the punch while the hopper 62 is in filling position abovesaid die openings.

Tablet ejectors In Figs. 1, 4, 6, 7 and a plurality of vertical tablet ejecting rods 88 are shown rigidly held in a sliding ejector rod block 89, which block is se-- The ejector rods 88 are adapted to form bottoms for the die openings I9, as well as to eject the compressed tablets 8! therefrom. I y

The punch block 25 and the ejectorrod block 89 are both retained on the rams 26 and 90 by means of clamping plates 9| and 92 respectively. Each of the clamping plates 9|, 92 is provided with a lip-93 (see Fig. 6) which overhangs shoulders 94 on the respective blocks whereby said blocks 25, 89, are clamped'firmly against the respective rams 26, 90 by means of bolts 95, 95 (see Fig. 13). The lips 93 and the shoulders 94 extend across the rams 26 and 90, so that the blocks 25, 89 may be horizontally moved to bring the punches 24 andejector 88 into alignment with the openings I9 in the die I8.

In the punch block and ram assembly, the

at19 (see Fig. 3) to.

block 25 abuts directly against the under face of the ram 26 (see Fig. 4), whereby a solid and rigid backing for the punches 26 is provided. In the ejector rod block and ram assembly, however, the block 89 lies above a central block 96 set into a transverse slot 91 which passes diametrically across the ram 90.

In order to prevent rotative movement of the ram 90 in the frame I6, provision is made of a vertically disposed key 98 (see Figs. 6 and '7), which interfits with said ram and said upper frame.

Modified mechanism for producing perforated pellets Referring now to Figs. 12 and 13, provision is made of a plurality of hollow punches 99, hollow ejector rods I00, and center pins or core rods IOI for cooperating with the die openings I9 of the die I8, as described above. The center pins I0l are rigidly supported by a stationary cross-bar I02 which extends through the transverse slot 91 in the movable ejector ram 90 and is secured at each of its ends to a pair of shoulders I03, I03 formed at opposite sides of the upright members 2| and 22, as by screws I04.

The center pins IOI extend upwardly to the upper surface of the die I8 and pass through the 'hollowejector rods I00 and lower ends of the hollow punches 99. By means of this construction, it will be seen that each tablet formed in the press will have a'central aperture. The portion of the opening 91 below the cross-bar E02 is left vacant in this arrangement to permit the ram 90 to be moved upwardly with respect to said bar I02 to actuate the ejector rods I00.

- Ejector-ram adjusting mechanismv The mechanism for vertically reciprocating the ejector ram 90 andthrough it the ejector rods 88 and for vertically adjusting said ram 90 for varying the stroke of the same in both forms of the invention will now be described. This mechanism comprises an elongated base plate I06 (see Figs. 5, 6 and '7), normally seated upon a horiizontal shoulder I01 provided in the base of the upper frame I6, which base plate extends between the upright frame members 25, 22, and is adapted to be vertically moved upon guide .pins I05. A horizontal bevel gear I08 mounted on a vertical axis is rotatively mounted in a cen- ,tral opening in the bottom of said base plate J6. The gear I08 is connected to a short hub I09 of an externally threaded cylindrical stud IIO which fits in an internally threaded open- .ing. III of the ejector ram 90.

Provision is also made of a horizontal spindle II 2 having a small bevel pinion IE3 secured by a pin II4 to its inner end which meshes with the horizontal gear I08. The spindle H2 extends laterally through the plate IIlt to a point outside the frame I6, and has a hand-wheel H5 mounted onits outer end to facilitate the manual rotation of the same. Rotation of the spindle H2 by the hand-wheel II5 will in turn rotate the stud IIO-to raise and lower the ejector ram 90 by means of itsoperative connection therewith-through the bevel gear I08 and the hub In order todrive the reciprocating ejector ram 90 from the main. shaft 48, provision is made of .base plate I06. The bars H6 are adapted to slide in diverging inclined grooves H1 formed in the upright members 2!, 22 of the upper frame I6.

To facilitate the movements of the slide bars H6, two pairs of guide rollers H8, I I8 are provided for the upper ends of said slides II6, the lower ends thereof being guided in grooves H9 formed in the lower frame I5. The slides H6 also have rollers I26 rotatably mounted on the lower ends thereof, which are arranged to ride in a pair of camming slots I2I, 122 formed in the opposite side faces of the large drive gear 52. Each of the cam slots I2 I, I22 is formed with a gradually rising cam section I23 corresponding to the rising movement of the tablet ejector ram 90. The cam slots IZI, I22 are also provided with a circular outer section 524 to produce a short dwell while the tablets are being pushed off of the die block H by the hopper 62. The cam slots l2I, I22 also have a steep section I25 to produce an abrupt drop corresponding to the lowering of the ejector ram 36. The remaining inner portion 526 of the cam slots :12 I, I22 is circular to produce a long dwell of the ejector rods 88 when they are at the bottom of the die openings I9 during the ccmpression of the tablets 61 by the punches 24-.

In order to cause the slide bars I I 6 to raise and lower the base plate I06, and by it the ejector rods 88, each slide bar H6 (Figs. 5, 6, 7, 8 and 9) has a pin I21 extending from one side thereof into a slide block I28 adapted to slide in a recess I29 formed in the side surface of a short link I30, which is pivoted at one end by a horizontal screw I3I to a boss I32 provided on the adjacent frame member 2! or 22.

As most clearly shown in Fig. 9, a short U- shaped block I33 straddles each link I30, and said blocks are provided with holes I34 in which are studs I35 extending from connecting blocks I36 slidably mounted on the opposite ends of the plate I06 adjacent the links I30. One of the connecting blocks I36 is threadedly engaged by the threaded portion I31 of the spindle IIZ, and the other block I36 is threadedly engaged by the threaded portion I38 of a similar spindle I39 disposed in the other end of the plate I06. A bevel pinion I40, similar to the pinion H3, is mounted on the inner end of the spindle I39 and meshes with the horizontal bevel gear I08, whereby the spindle I39 may be rotated in unison with the spindle H2, when the hand-wheel H5 is turned, to simultaneously move the blocks I36 in opposite directions along the plate I06 to adjust the effective position of the short links I30. The amount by which the base plate I06 is raised by the slide bars H6 may thus be Varied according to the desired stroke of the ejector ram 90. This will insure the positioning of the ejector rods 86, when at the limit of their upward stroke, at the level of the upper surface of the die block I8, irrespective of the thickness or length of the tablet 81 being formed. The lowermost position of said rods 88 with respect to the punches 24 will also be adjusted simultaneously with adjustment of the stroke of said rods 68 by manipulation of the hand wheel H5, whereby the thickness of the tablets 81 may be varied at will.

For the purpose of sealing the operating parts of the machine, four fiat metal sheets I4I, I42, I43 and I44 are employed to completely enclose the lower part of the structure, whereby the interior operating parts of the machine will be protected against dust or powdered material. The lower machine frame I5 is also formed with a bottom I45, which with side partitions I46 (Fig. 2) forms an oil retaining pocket in which a pump (not shown) may be disposed to force oil through suitable conduits (not shown) leading to the moving partsof the machine in a well known manner. To assist in maintaining the front of the machine closed against the ingress of dust etc., a washer plate E41 (Fig. 4) is mounted on the spindle H2, and is carried thereby when the plate I06 is moved vertically up and down during its operating movements.

Figs. 14-16 inclusive illustrate a modified means to agitate a reciprocable inclined hopper I50, which may be connected by a tube 63 to a source of powder supply as in thepreviously described form. In this modified form of the invention, the powder is loosened by shocks instead of by movements of the bail 80 as in the first form. The hopper I50 is reciprocated over the upper face of the die plate I8 by means of links 61 connected to the reciprocating head 21. The lower ends of the links 61 are adjustably connected to a slide I5I by means of trunnions I52 and I53 journaled in said slide. The trunnions I52 and I53 extend from opposite sides of a boxlike member I54 which is slidably mounted upon a rectangular central portion I55 of the slide I5 I. The box member I54 may be longitudinally adjusted .upon the central portion I55 by turning a horizontal thumb screw I56, and said box 6 member may be rigidly clamped in its adjusted position by a vertical set screw I51.

The slide I5! is mounted upon parallel rods I 58 and I59 which extend outwardly from a bracket I66 secured to the frame I6, as by screws I6I.

The rods I58 and I53 are supported at a point spaced from the frame I6 by a pair of upstanding lugs I 62 provided at the outer end of the bracket I60. The slide I5I is connected to a cross-bar I63, slidably mounted on the rods I 58 and I 59 by a pair of centrally positioned parallel links I64 and I65 which are pivoted by pins I68 and I69 to lugs I66 and I61, respectively, provided on the slide I5I. The links I64 and I65 are also pivotally connected to the crossbar I63 by means of a cross-shaft I10. A bellcrank pendulum lever III is swingably mounted upon the shaft I10 between the links I64 and I65 and has a pair of cylindrical disc-shaped weights I12 and I13 secured upon the lower free P end thereof.

In order to connect the bell-crank lever I1I with the hopper I50, a short arm I14 is provided upon the lever HI and extends from the shaft I16 toward said hopper, which is preferably secured to one end of a cylindrical bar I15 by a bracket I16, and the-bar I15 extends from the hopper I 50 through the central portion I55 of the slide 'I5I within which it is freely slidable. The bar I15 is connected to the short arm I14 of the bell-crank lever I1I by a link I11 which is pivotally secured at each of its ends to the arm I14 and the bar I15, respectively. A tapped collar I18 is screwed upon the protruding end of the bar I15 and may be clamped in any desired adjusted position by a set screw I10. The connection constituted by the link I11 and the short arm I14 constitutes a toggle joint between the bell-crank pendulum lever HI and the bar I15.

Operation In operation, after the proper die I6 has been assembled in the die block I1, the punch block 25 will be adjusted vertically to the desired point by means of the hand-wheel 35. The ejector block 89 will likewise be adjusted as desired by turning the hand-wheel I I5. The ejector rods 88 will form the bottoms for the die openings I9 during the punching process and will thereafter be raised to bring their upper ends to the level of the upper surface of the die It to eject the tablets. A standard length of ejector rod 88 will preferably be used for, all sizes of tablets.

It will be understood that one of thecamming slots I2I and IE2 will be advanced angularly with respect to the other due to the spacing apart of the slides II5, so that the lifting action of the gradual rise sections I23 of said camming slots will occur simultaneously upon the slides IIB. This will cause the plate Hi6 and the ejector ram 90 to rise andto eject the formed tablets 8? just before the horizontal head 21 carrying the punches 24 reaches its limit of upward stroke. The dwell occasioned by the outermost camming slot section I24 is sufficiently long to permit complete vertical ejection of the tablets 8? as above described, and also .permits of a slight downward movement of the horizontal head 21 and a rearward movement of the hopper 52 to take place. The abrupt drop occasioned by the camming slot section I25 disposes the ejector rods 88 in their normal bottom position with the base plate I56 resting on the shoulder II,-the rods 88, ram 30, stud H and plate I06 being thus rigidly supported by the upper frame It and insuring a solid and firm abutment against which the punches 24 may act to compress the powdered materialin the dies into solid tablets 81. and backward movement of the hopper 62 as above described, which occurs in timed relation between the strokes of the punches 2d and the ejector rods 88, the wire agitator bail 8i] will be swung to and fro across the die openings 53 by the pendulum action of the arms 83 and the weight 85,-thus insuring the complete filling of the die openings with the'powdered material. I

While the machine is in operation, the base plate I06 will be alternately moved from its full line position to the dotted line position and back again, as shown in Fig. 6, this movement being caused by the swinging of the links I30 upwardly by the slides IIIS. This is due to the connection I of said links I36 to the pins 2'5 and also to the connection between the links I36 and the plate I06 by the spindle moved blocks I36 and the studs I35.

It will also be understood by referring to Fig. 8 that the pins I27 and slide blocks I28 will move upwardly with the slide I I6 asfar as permitted by the rise section I23 of the camming slots IM and I22,the amount of said upward movement being controlled by the position of the blocks I33, I36 in'respect to the pivot point of the link I30 and with respect to the screw I3I. As illustrated in Fig. 8, at each stroke of the press .(or revolution of the gear 52) the pin I21 will rise to the position indicated by the numeral I49. The stud I35 and the blocks I33, I35, however, will move only from the full line position shown in said figure to a point I50 indicated by dotted lines, causing the base plate I06 to be raised, and with it the ejector dotted line position I52.

"leverage distance between the stud rods 88, from the dotted line position I5I to the By adjusting the blocks I33, I36 and the stud I35 into the dot-and-dash line position indicated at I53, the plate I06 will be raised only to the dot-and-dash line position indicated at I54 due tothe shortening of the I35 and the arm pivot at I3I.

During the forward Inthe use of the modified former the powder agitating mechanism shown in Figs. 14-16, the hopper will be moved across the die plate I8 by the reciprocation of the head 21 due to the connecting link 61. During its forward movement, (to wit: toward the left in Fig. the hopper I50 will assume the position shown in full lines, and the pendulum lever I1! I13 due to inertia will move to the right, as also shown in full lines,this action serving to suddenly push the hopper still farther to the left beyond its normal reciprocating movement. As soon as this left'stroke is completed, the pendulum arm Iii and the weights I12, I13 will fall to the dotted position shown in Fig. 15 drawing the hopper slightly backward (to the right). The hopper I58 will thus be abruptly shaken causing the powder therein to suring a complete filling of the die openings I9 with said powder.

One advantage of the present invention is that the centrally disposed driving gear which has camming slots in its opposite faces and the oppositely disposed crank links 44 and slides I I3, pro duces a balanced mechanism which is capable of withstanding comparatively heavy stresses without occasioning vibration or uneven operation. The use of the machine herein disclosed will result in a material increase in production of tablets of any size or form, and since adjustments may be made without disassembling the machine, shutl downs for repairs and adjustment, or for changing the size of tablets will be reduced to the minimum.

be loosened, and thus in-- While there have been disclosed in this speci- I fication several forms in which the invention? may be embodied, it is to be understood that these forms are shown for the purpose of illustration only, and that the invention is not to be limited to the specific disclosures, but may be modified and embodied in various other forms. without departing from its spirit. In short, the

invention includes all the modifications and embodiments coming within the scope of the following claims.

' -Having thus fully described the invention,

what is claimed as new, and for which it is desired to secure Letters Patent, is: i

1. In a tablet making machine, a die, a punch adapted to enter said die, means to reciprocate said punch into and out of said die, a hopper containing powdered material having a bottom opening therein adapted to slide over said die,

means to move said hopper over the die to permit material to drop therefrom into said die between successive strokes of said punch, said hop per being driven by the reciprocating movement of said punch, and swinging pendulum means actuatedby the movement of the hopper and connected to said hopper for automatically agitating it.

2. In a tablet making machine, a die, a punch adapted to enter said die, means to reciprocate said punch into and out of said die, a hopper containing powdered material having a bottom opening therein adapted to slide over said die,

means to move said hopper over the die to permit material to drop therefrom into said die be tween successive strokes of said punch, said hopper being driven by the movement of said punch, and swinging pendulum means actuated by the movement of the hopper and connected to said hopper for automatically agitating it, said pendulum means being connected to said hopperby a'loose toggle joint.

3. Ina tablet making machine, a die having an opening therethrough, a reciprocable punch adapted to enter the die opening rom the top thereof, a reciprocable ejector rod in said die opening and adapted toserve as the bottom thereof, mechanism for reciprocating said punch.

to compress powdered material within the die opening into table form inc uding a driven shaft, means connected with said shaft to reciprocate said punch, a second means connected with said shaft without lost motion for subsequently driving said ejector rod upwardly to eject said tablet and to move said rod downwardly at all adjustments, and means to adjust the length of stroke of said ejector rod so that it will be flush with the top of said die after the tablet has been ejected irrespective of the depth of said tablet.

4. In a tablet making machine, a die having an opening therethrough, a reciprocable punch adapted to enter the die opening from the top thereof, a reciprocable ejector rod adapted to enter the die opening from the bottom and adapted to serve as the bottom of said die opening, mechanism for reciprocating said punch to compress powdered material within the die opening into tablet form including a driven shaft, means connected with said shaft to reciprocate said punch, a second'means connected with said shaft for subsequently driving said ejector rod upwardly to eject said tablet, means to adjust the height of said punch, and other means to adjust the position of said ejector rod at the bottom of its stroke to control the size and compression of said tablet without lost motion in the stroke thereof.

5. In a tablet making machine, a punch, a die having an opening therethrough shaped to fit said punch, an ejector rod adapted to form the bottom of said die opening, means to raise said ejector rod to eject the tablet after the downward stroke of said punch, and common means to simultaneously adjust the length of the stroke of the ejector rod and its bottom position in said die opening and without changing the dwell peried of the rod while it is flush with the die.

6. In a tablet making machine, a die, a punch adapted to enter said die, means to reciprocate said punch into and out of said die, a hopper containing powdered material having a bottom opening therein adapted to slide over said die, means to move said hopper over the die to permit material to drop therefrom into said die between successive strokes of said punch, said hopper being driven by the reciprocating movement of said punch, an agitator member in said hop er swingably movable across the die opening, and pendulum means swingable by the motion of said hopper to vibrate said agitating means.

7. In a tablet making machine, a die, an ejector rod adapted to form a base for said die, means to reciprocate said rod including a rotatable cam member disposed below said die, a vertically movable base plate carrying said rod, a slide member operatively connected to said cam member, a pivoted arm connecting said slide member and said base plate, and means to adjust the position of said ejector rod in said die, means to adjust the connection between said arm and said base plate to vary the length of the vertical stroke of said base plate so that said ejector rods will be flush with the dies after ejection of 'the tablets, and common means to simultaneousable base plate carrying said rod, a slide member operatively connected to said cam member, a pivoted arm connecting said slide member and said base plate, and means to vary the position of said ejectorrod in said die.

9. In a tablet making machine, a die, an ejector rod adapted to form a base for said die, means to reciprocate said rod including a rotatable cam member disposed below said die, a vertically movable base plate carrying said rod, a slide member operatively connected to said cam member, a pivoted arm connecting said slide member and said base plate, means to vary the position of said ejector rod in said die, and means to adjust the connection between said arm and said base plate to vary the length of the vertical stroke of said base plate so that said ejector rods will be flush with the dies after ejection of the tablets.

10. In a multiple tablet making machine, a die block containing a plurality of dies, a punch block containing a plurality of punches fitting said dies, an ejector block having a plurality of ejector rods fitting said dies and serving to form the bottoms of the die openings during the tablet compressing operation, means disposed below said dies to reciprocate said punch block while said ejector block and rods remain stationary to compress powdered material in said dies into tablets, cam means associated with said reciprocating means and disposed below said die to subsequently lift said ejector block to bring said ejector rods flush with the tops of said dies and eject said tablets, and to then retract said ejector rod downwardly without lost motion.

11. In a tablet making machine, a frame, a pair of spaced upright members supported by said frame, a stationary die block supported by said upright members, a vertically slidable ejector rod blocksupported by said frame between said upright members and in vertical alignment with said die block, a plurality of vertical tie rods slidable in said upright members, a horizontal head carried by the upper ends of said tie rods, a punch block supported by said head and carrying a punch in alignment with the die in said die block, and means disposed below said die to hold said ejector rod stationary while the punch is moving downwardly to compress the tablet in said die, and means comprising a plurality of telescoping tubular sections containing a coiled spring reacting between said frame and said head to press said head upwardly.

12. In a tablet making machine, a frame, a pair of spaced upright members supported by said frame, a stationary die block supported by said upright members, a vertically slidable ejector rod block supported by said frame between said upright members and in vertical alignment with said die block, a plurality of vertical tie rods slidable in said upright members, a horizontal heads carried by the upper ends of said tie rods, a punch block supported by said head and carrying a punch in alignment with the die in said die block, means disposed below said die to hold said ejector rod stationary while the punch is moving downwardly to compress the tablet in said die, and a common source of power in said frame below said die block for driving said punch block and said ejector rod block in proper synchronism.

13. In a tablet making machine, a stationary die, a punch carrying block above said die, a slidable head carrying said block, said block having a threaded sleeve adjustably screwed into said head, a gear fixed to said sleeve, and atv manually operated pinion meshing with said gear to adjust the position of said sleeve and block with respect to said head.

14. In a tablet making machine, a stationary die, a punch carrying block above said die, an

ejector-rod-carrying block located below said die,

, cate said hopper across said die between the strokes of said punch block, said hopper member serving to push the tablets after ejection by said ejector rods oifsaid die, said hopper reciprocating means including an inclined link having alost-motion connection withsaid block reciprocating means and an adjustable pivotal connection with said hopper member. p

15. In a tablet making machine, a stationary die, a punch carrying block above said die, an ejector-rod carrying block located below said die, means to reciprocate said blocks with respect to said die, a horizontal hopper member containing powdered material slidable upon said die, said hopper having an open bottom, means driven by the block reciprocating means to reciprocate said hopper across said die between the strokes of said punch block, said hopper member serving to push the tablets after ejection by said ejector rods off said die, and a freely swingable powder agitator located therewithin to facilitate the filling of said die from said hopper, said agitator including a pivotally mounted wire bail, and a freely swingable pendulum to swing said bail whenever the open bottom of said hopper lies over said die.

16. In a tablet-making machine, a frame, a

stationary die supported by said frame, a reciprocating punch movable into said die from above, a reciprocating ejector rod in said die,

. a slidable block for carrying said ejector rod,

a horizontal driven shaft in the base of said frame, a cam carried by said shaft, a vertically slidable ram carrying said block, a vertically movable base plate tion with said ram, said base plate having a pair of opposed inclined guide slots, a pair of inclined cam operated slide bars located in said slots, the lower ends of said slide bars engaging said cam whereby said base plate. ram and ejector rod block will be successively raised and lowered.

17. In a tablet making stationary die supported by said frame, a reciprocating punch movable into said die from above, a reciprocating ejector rod in said die, a slidable block for carrying said ejector rod, a horizontal driven shaft in the base of said frame, a cam carried by said shaft, a vertically slidable ram carrying said block, a vertically machine, a frame, a

having adjustable connec movable base plate having adjustable connection with said ram, said base plate having a pair of opposed inclined guide slots, a pair of inclined cam operated slide bars located in said slots, the lower ends of said slide bars engaging said cam whereby said base plate ram and ejector rod block will be successively raised and lowered, and adjustable means extending outside said frame for manually controlling the length of the up and down strokes of said base plate, ram and ejector rod.

18. In a tablet making machine, a frame, a stationary die supported by said frame, a reciprocating punch movable into said die from above, a reciprocating ejector rod in said die, a slidable block for carrying said ejector rod, a horizontal driven shaft in the base of said frame, a camcarried by said shaft, a vertically slidable ram carrying said block, a vertically movable base plate having adjustable connection with said ram, said base plate having a pair of opposed inclined guide slots, a pair of inclined cam operated slide bars located in said slots, the lower ends of said slide bars engaging said cam whereby said base plate and ejector rod block will be successively raised and lowered, said slide bars being adjustably connected to said base plate by slidable blocks and link members.

19. In a tablet making machine, an enclosed frame, a stationary die, a reciprocating punch movable into said die ing ejector rod movable into said die from below, means .to hold said ejector rod stationary to form the bottom-of said die during the punching operation, separate means extending outfrom above, a reciprocatpunch from the die and the stationary bottom position of said ejector rod, the top of said ejector rod lying flushwith the surface of said die at the top of the stroke of said rod.

20. In a tablet making machine, a die, a punch carrying block above said die and movable with respectthereto, an ejector, a horizontally movable open-bottom' hopper member slidable upon said die between successive strokes of said block, said hopper member serving to push the tablets after ejection away from said die, and weight and inertia-operated means for agitating said hopper to loosen the powder therein.

21. In a tablet making machine, a, vertically reciprocable punch, a stationary die, a vertically movable ejector rod, rotatable means driven by a source of power and disposed below said die and ejector rod forreciprocating said punch and moving said ejector rod, said means including a single shaft having a crank portion thereon connected to said punch for reciprocating it, and a cam thereon 'operably connected to said ejector rod for moving it. 

